Nice grinder Rockhound. If I may be so bold, if you have a tap set I might suggest you might want to drill and tap a small 6-40 screw hole on the small plate you JB welded to the bottom of the platen to hold the glass just for insurance. The JB Weld will probably be good enough and it's good to around 600 degrees assuming you used the two part regular JB Weld epoxy. I'm a nervous nancy on grinder safety, but that is what I'd do. If that glass ever does come loose it will be a miracle if you don't get hurt and I wouldn't trust even JB Weld. I saw you wrote welded the lip, but I didn't see a weld so I think you might have meant JB welded? If it is metal welded in one way or another then please disregard my suggestion.